Hi there-
Apologies for the length of this post and variety of issues. I recently inherited a Vitodens 200W Gas boiler with my home purchase. I'm in the US and it seems these are rare here. The local contractor who installed it did so under protest and spends half of every conversation I have with them complaining about it, so I'm hopeful someone on these forums might have a more positive outlook and give more consideration to some of my questions (instead of just dismissing things as the unit being "finicky"). Thank you in advance.
1- EE Fault
Every few days or so the unit shuts down with Fault code 1 EE. I go down and reset it and it runs fine for another 24-72 hours before happening again. My local contractor is waiting on a replacement igniter (and another part I don't remember) to hopefully resolve the issue, but they don't seem optimistic. Anyone have more details about potential causes or DIY remedies for this intermittent fault?
2- Room temperature is not stable
My understanding is this unit uses the outdoor temperature along with "slope" and "offset" settings to decide how much heat to provide, in an effort set keep a consistent room temperature. I find this frustrating.
In typical winter temperatures (~30F) I set the room temperature to 61F to keep my house where I want. Upstairs is a lot warmer than downstairs, so I aim for 70F upstairs and 66F downstairs as a compromise. Setting at 61 seems to do it, if it's cold outside.
The problem is as it warms up outside, it gets cold inside. I need to move the setting up from 61F to about 63F to keep the house where I want it if it's ~50F outside. This is a constant battle of trial & error.
The local contractor moved the slope setting from the default of 1.6 down to 1.5 as an attempted fix, but I've not noticed much difference. Can anyone speak more to how these settings impact things and give some more precise guidance than arbitrarily changing things and seeing what happens?
3- Can't set some temperatures
This is as simple as it sounds. I literally cannot set the room temperature to certain temperatures. If I move the dial to 60F and press OK, when I go back and look it's back to 61F. It seems to require odd temperatures. If I move it to 58F, press OK, when I go back and look it's shifted to 59F. Same thing happens with reduced room temp. At higher temperatures, it seems to want evens. If I move it to 67F and press OK, when I look again it's shifted to 66F or 68F (depending on which direction I came from).
What is happening here, is this just how it works?
Thanks again for any and all thoughts,
Pat
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